Loans (Period-End Balances And Various Asset Quality Attributes By Origination Vintage For The HELOC) (Details)	Sep. 30, 2015 USD ($) number		Dec. 31, 2014 USD ($)	Sep. 30, 2014 USD ($) number
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income | $	$ 16,725,492,000	[1]	$ 16,230,166,000	$ 15,812,017,000
Home Equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance | $	$ 2,163,592,000			$ 2,558,295,000
Avg orig FICO	742			741
Avg Refreshed FICO	733			732
Loans, net of unearned income | $	$ 2,163,592,000			$ 2,558,295,000
Home Equity | Origination Vintage Period Pre 2003
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance | $	$ 42,651,000			$ 61,659,000
Avg orig FICO	707			708
Avg Refreshed FICO	702			703
Home Equity | Origination Vintage Period 2003
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance | $	$ 79,768,000			$ 111,031,000
Avg orig FICO	720			722
Avg Refreshed FICO	710			709
Home Equity | Origination Vintage Period 2004
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance | $	$ 215,749,000			$ 312,590,000
Avg orig FICO	722			724
Avg Refreshed FICO	709			711
Home Equity | Origination Vintage Period 2005
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance | $	$ 341,878,000			$ 476,226,000
Avg orig FICO	730			732
Avg Refreshed FICO	715			722
Home Equity | Origination Vintage Period 2006
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance | $	$ 288,858,000			$ 351,818,000
Avg orig FICO	738			740
Avg Refreshed FICO	728			727
Home Equity | Origination Vintage Period 2007
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance | $	$ 310,250,000			$ 369,635,000
Avg orig FICO	744			744
Avg Refreshed FICO	729			729
Home Equity | Origination Vintage Period 2008
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance | $	$ 176,625,000			$ 200,908,000
Avg orig FICO	753			753
Avg Refreshed FICO	749			748
Home Equity | Origination Vintage Period 2009
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance | $	$ 88,937,000			$ 105,576,000
Avg orig FICO	751			752
Avg Refreshed FICO	745			743
Home Equity | Origination Vintage Period 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance | $	$ 84,594,000			$ 100,727,000
Avg orig FICO	754			754
Avg Refreshed FICO	748			749
Home Equity | Origination Vintage Period 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance | $	$ 81,754,000			$ 100,842,000
Avg orig FICO	759			759
Avg Refreshed FICO	753			753
Home Equity | Origination Vintage Period 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance | $	$ 103,906,000			$ 121,149,000
Avg orig FICO	760			759
Avg Refreshed FICO	756			757
Home Equity | Origination Vintage Period 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance | $	$ 129,742,000			$ 158,256,000
Avg orig FICO	757			759
Avg Refreshed FICO	755			760
Home Equity | Origination Vintage Period 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance | $	$ 115,449,000			$ 87,878,000
Avg orig FICO	761			761
Avg Refreshed FICO	764			761
Home Equity | Origination Vintage Period 2015 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance | $	$ 103,431,000			$ 0
Avg orig FICO	762			0
Avg Refreshed FICO	762			0

[1] September 30, 2015 includes $30.7 million of held-to-maturity consumer mortgage loans secured by residential real estate in process of foreclosure.